Universal joint



July 20, 1937. N. TRBOJEVICH UNIVERSAL JOINT Filed March 2, 1936 FIG.2.

FIG.3.

INVENTOR NIKOLA TRBOJEVICH BY wunm am WW W A TTORNEYS Patented July 20,193i t UNITED STATES PATENT OFFICE UNIVERSAL JOINT Nikola Trbojevich,Detroit, Mich.

Application March 2, 1936, Serial No. 66,663

3 Claims. (Cl. 6421) The invention relates to an improvement in untilonly a slight backlash remains. The rings universal joints of theanti-friction and constant may be secured in position by a small key orpin velocity type. not shown in the drawing.

One of the objects of the invention is to obtain The theory of thisjoint is based on the fact 5 a new type universal joint which hasstrictly that if I first mount the drive shafts H and 22 5 constantvelocity in both shafts. in such a manner that they are spherically ro-Another object is to construct a joint capable tatable about the balll9, their point of inter of sustaining high loads and speeds andpermitsection, if I further constrain the said point of ting of aconsiderable angular variation. intersection always to remain in theplane 26,

The principle upon which this joint is de- Figure 3, and also constrainthe four rollers 14 10 signed is to my knowledge new and unusual in toremain in lines perpendicular to the said that the joint is not designedabout a sphere as plane, a condition will be created, necessary and wasformerly customary, but consists essentially sufficient, to cause theshaft 22 to respond as an of two crosses sliding in a double barreledtube image in a mirror (the plane 26) to any and all 15 and soconstrained as to remain in a symmetrical possible motions of the shaftI l. Thus, if I hold 15 position relative to the said tube at all times.the shaft II in position and tilt the shaft 22 to By thismeansIobtainastrictly constant velocity any angle whatever in the planeof paper or in both shafts. perpendicularly thereto, the plane 26 willassume In the drawing: a position exactly bisecting the shaft angle. ItFigure 1 is the principal cross section of my is readily seen from thisgeneral symmetry of the 20 improved joint with drive shafts aligned;mechanism that upon uniformly rotating the Figure 2 is a section takenin the plane 2--2 of shaft II at any shaft angle whatever within theFigure 1; limits of the device, the shaft 22 will also rotate Figure 3is a diagram explanatory of the geouniformly and with the same angularvelocity. 25 metrical principle involved and drawn in the It is alsotobe noted that while the two shafts 25 same plane as Figure 1. rotateeach with a uniform velocity, the sleeve As shown in Figures 1 and 2,the drive shaft l l 24 rotates with a variable velocity. For this reaisintegral with the crosspin I2 at right angles son I design the sleeve ofas small a mass as thereto, the latter terminating in twosymmetripossible. cally disposed journals l3, each rotatably carry- WhatI claim as my invention is: 30

ing a truncated spherical roller [4. Coaxially 1. A universal jointcomprising two shafts inwith the shaft II a center stud I5 is driven intersecting each other in a spherical joint, means the hole provided inthe said shaft and secured for constraining the motion of the said point.of in that position by means of the pin I6. The intersection in aplane, a cylindrical sleeve proouter end of the said stud is formed intoa sphervided with a plurality of longitudinal grooves-at- 35 ical sectorIT capable of contacting with the tached to and perpendicular to thesaid' plane spherical ring l8 on its outside and with a ball and aplurality of drive arms extending from their l9 on its inside. Thespherical ring I8 is threadrespective shafts and slidably fitting intothe said ed on its outside and fits into the corresponding grooves ofthe sleeve.

40 threaded hole of the sliding key 20, the latter 2. A universaljointcomprising two shafts in- 40 having two rectangular extensions 2| asshown tersecting each other in a spherical joint, two in Figure 2.driving arms attached to each shaft, a cylindrical The driven shaft 22with all its accessories is sleeve having two grooves diametricallydisposed an exact duplicate of the above described drive and slidablyhousing the extremities of the said 5 shaft ll. four drive arms, and asliding member housing The rollers l4 closely fit into the twocylindrical the said spherical joint and guiding it in a plane grooves23 formed in the sleeve 24. The said perpendicular to the said sleeve.sleeve is also provided with two rectangular slots 3. A universal jointcomprising a double bar- 25 in its midportion and perpendicular to itsaxis reled cylindrical sleeve, a spherical joint slidable which permitthe key extensions 2| to slide therein a plane perpendicular to the saidsleeve, two 50 in right and left, and up and down, Figure 2, but shaftsconnected to the said joint and also carrycannot get out of thatmidplane. ing two drive arms each, the extremities of which Inassembling the joint I first slip the rings arms are slidable in thesaid two barrels of the l8 upon the studs l5, then insert the studs 15sleeve. and the pins i6, insert the key 20 in the slot NIKOLATRBOJEVICH. 55

25, slip in the ball I9 and tighten the rings I8

